make multicore optional

fuzzers/wcet_qemu_sys/src/bin/fuzzer.rs

@@ -302,7 +302,7 @@ fn fuzz(
     });
 
     //====== Child Function
-    let mut run_client = |state: Option<StdState<_, _, _, _, _>>, mut mgr, _core_id| {
+    let mut run_client = |state: Option<StdState<_, _, _, _, _>>, mut mgr, _core_id| -> std::result::Result<(), libafl::Error> {
 
     //====== Set up Emu and termination-point
     let emu = Emulator::new(&args, &env);
@@ -467,6 +467,7 @@ fn fuzz(
     #[cfg(unix)]
     let file_null = File::open("/dev/null")?;
     #[cfg(unix)]
+    #[cfg(feature = "multicore")]
     {
         let null_fd = file_null.as_raw_fd();
         dup2(null_fd, io::stdout().as_raw_fd())?;
@@ -482,20 +483,32 @@ fn fuzz(
 
     };
 
-    match Launcher::builder()
-        .shmem_provider(shmem_provider)
-        .configuration(EventConfig::AlwaysUnique)
-        .monitor(monitor)
-        .run_client(&mut run_client)
-        .cores(&Cores::from_cmdline("all").unwrap())
-        // .broker_port(1337)
-        // .remote_broker_addr(remote_broker_addr)
-        //.stdout_file(Some("/dev/null"))
-        .build()
-        .launch()
+    // Multicore Variant
+    #[cfg(feature = "multicore")]
     {
-        Ok(_) | Err(Error::ShuttingDown) => (),
-        Err(e) => panic!("{:?}", e),
-    };
-    Ok(())
+        match Launcher::builder()
+            .shmem_provider(shmem_provider)
+            .configuration(EventConfig::AlwaysUnique)
+            .monitor(monitor)
+            .run_client(&mut run_client)
+            .cores(&Cores::from_cmdline("all").unwrap())
+            // .broker_port(1337)
+            // .remote_broker_addr(remote_broker_addr)
+            //.stdout_file(Some("/dev/null"))
+            .build()
+            .launch()
+        {
+            Ok(_) | Err(Error::ShuttingDown) => (),
+            Err(e) => panic!("{:?}", e),
+        };
+        Ok(())
+    }
+
+    // Simple Variant
+    #[cfg(not(feature = "multicore"))]
+    {
+        let stats = SimpleStats::new(|s| println!("{}", s));
+        let mgr = SimpleEventManager::new(stats);
+        run_client(None, mgr, 0)
+    }
 }